Speaker
Description
With mono-photon signature, high energy e$^+$e$^-$ colliders offer unique possibility to look for processes with fully invisible final state, pair-production of dark matter particles in particular. Most studies in the past focused on scenarios assuming heavy mediator exchange. However, scenarios with light mediator exchange are still not excluded by existing experimental data, if the mediator coupling to Standard Model particles is very small. Results on the expected sensitivity of the 500 GeV ILC and the 3 TeV CLIC to scenarios with both heavy and light mediator exchange were presented recently based on a novel approach, where the experimental sensitivity is defined in terms of the mediator mass, width and
coupling to the electrons.Included in this contributions are new results on the sensitivity of the 250 GeV Higgs Factory to dark matter pair-production via light mediator exchange.
